Deep beneath our feet, the Earth is simmering. Heat from the planet’s ancient core combines with heat generated by radioactive decay. The deeper we go, the hotter it gets: temperatures rise by roughly 30 degrees Celsius with every kilometre of depth. If we can bring this virtually inexhaustible heat to the surface, even the coldest winter days become much easier to face. This valuable source of energy had been lying beneath Lenti all along. Thermal